This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
Make a checkerboard matrix
Create a Multiplication table matrix...
Length of a short side
Cumulative product of a vector
modulus of a number
multiply an array by its position number
Find the last digit
Determine whether the input is divisible by 3 as well as 5
find a specific element from an matrix
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